<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>DOM Level 2 Core</title>
</head>
<body>
  <script>
    const xmldom = document.implementation.createDocument('', 'root', null);

    console.log(xmldom.documentElement.tagName);  // "root"

    const child = xmldom.createElement('child');
    xmldom.documentElement.appendChild(child);
    console.log(xmldom);
  </script>
</body>
</html>